Chapter 2: Current and Historical
Trends in Use, Management and Disturbance of United States Forest
Lands-English Unit Databy Richard A. Birdsey & George M. Lewis

Table 20. Average area affected
by selected insects and diseases, by region of the Western U.S.,
1986-19971.

Mountain

Western

pine

spruce

Spruce

Dwarf

beetle

budworm

beetle

mistletoes

(1000 ac/yr)

Region

Great Plains

5.0

0.0

0.0

0.0

Intermountain

381.3

1,831.3

0.0

11,611.3

Pacific Coast

752.9

2,184.2

0.0

14,389.4

Alaska

0.0

42.6

523.3

3,400.0

Total

1,139.1

4,058.2

523.3

29,400.8

1From USDA Forest Service reports.

Users of these tables are kindly requested
to cite their source:
Birdsey, Richard A.; Lewis, George M. 2002. Current and Historical
Trends in Use,
Management and Disturbance of United States Forest Lands. IN: Kimble,
John et al. (eds.),
The Potential of U.S. Forest Soils to Sequester Carbon and Mitigate
the Greenhouse Effect.
Boca Raton, Florida: CRC Press. XXX p.